ORPHA:93952
X-linked intellectual disability, Hedera type
Also known as: MRXSH
Query health: suspect — Only one of 3 strategies returned hits (phrase).
Publications
46
46.2th percentile
Trials
0
Interventional, condition-specific
Researchers
363
Distinct authors in sample
Gene link
ATP6AP2
Strong
Readiness
2/6
Stages with a signal
Clinical definition (Orphanet)
X-linked , Hedera type is a rare X-linked syndrome characterized by an onset in infancy of delayed motor and speech milestones, generalized tonic-clonic and drop attacks, and mild to moderate . Additional, less common manifestations include scoliosis, (resulting in gait disturbance), and bilateral pes planovalgus. Physical appearance is normal with no features reported.
How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.
Cross-references
Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.
- MONDO:0010319
- MeSH:C564516
- OMIM:300423
- UMLS:C1845543
Additional Mondo synonyms (5)
MRXE · X-linked intellectual disability with epilepsy · intellectual developmental disorder, X-linked, syndromic, Hedera type, X-linked recessive · intellectual disability, X-linked, syndromic, Hedera type · mental retardation, X-linked, syndromic, Hedera type
Research stages
Trial readiness signals
Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”
2/6 stages with a signal
No matched interventional trial; the gene is known and literature exists — preclinical or natural-history work may still be the practical next step.
- Gene identifiedPresent
Strong — ATP6AP2
- LiteraturePresent
46 matched papers (34 in last 10 years) Source
- Phenotype characterisedNot checked
Not yet enriched from Monarch / HPO
- Animal modelNot checked
Not yet enriched from Monarch / Alliance
- Orphan designationNot checked
FDA/EMA orphan-drug designation not enriched yet
- Interventional trialNot found
No matched interventional trial under our ClinicalTrials.gov rules
Biology
Genes and phenotypes
Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.
Do we know what causes it?
Yes — we know a specific gene responsible (ATP6AP2).
GenCC classification: Strong.
Phenotypes (Monarch / HPO)
Not enriched in this build — Monarch phenotype joins were not run for this record.
Animal models (Monarch / Alliance)
Not enriched in this build.
Literature
Is anyone studying this?
46
46 papers have ever been published on this condition (under this name). For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.
46 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).
34 in the last 10 years · medium confidence · 46.2th percentile (publications denominator)
Phrase hits: 46 · MeSH hits: 0
Who's working on it?
363
Distinct author names in 46 sampled papers — named people below.
Who's working on it?
No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.
- 01Gecz J3 papers · 2018
School of Medicine, The University of Adelaide, Adelaide, SA, Australia.
Papers in Europe PMC - 02Bird TD2 papers · 2022
Department of Neurology, University of Washington, Seattle, WA, USA; Geriatric Research, Education and Clinical Center (GRECC), VA Puget Sound Medical Center, Seattle, WA, USA.
Papers in Europe PMC - 03Bungert-Plümke S2 papers · 2022
Institute of Biological Information Processing, Molecular and Cellular Physiology (IBI-1), Forschungszentrum Jülich, Jülich, Germany.
Papers in Europe PMC - 04Fahlke C2 papers · 2022
From the Institute of Complex Systems, Zelluläre Biophysik (ICS-4), Forschungszentrum Jülich, 52425 Jülich, Germany c.fahlke@fz-juelich.de.
Papers in Europe PMC - 05Franzen A2 papers · 2022
Institute of Biological Information Processing, Molecular and Cellular Physiology (IBI-1), Forschungszentrum Jülich, Jülich, Germany.
Papers in Europe PMC - 06Guzman RE2 papers · 2022
From the Institute of Complex Systems, Zelluläre Biophysik (ICS-4), Forschungszentrum Jülich, 52425 Jülich, Germany r.guzman@fz-juelich.de.
Papers in Europe PMC - 07Kiianitsa K2 papers · 2022
Department of Immunology, University of Washington, Seattle, WA, USA.
Papers in Europe PMC - 08Korvatska O2 papers · 2022
Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, USA; Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Medical Center, Seattle, WA, USA. Electronic address: ok5@uw.edu.
Papers in Europe PMC - 09Li Y2 papers · 2025
Center for Kidney Diseases, the Second Affiliated Hospital of Nanjing Medical University; Nanjing, China, 210009, 262 North Zhongshan Road, Nanjing, Jiangsu, China.
Papers in Europe PMC - 10Premarathne S2 papers · 2016
The Eskitis Institute for Drug Discovery, Griffith University , Brisbane, Queensland, Australia.
Papers in Europe PMC
Clinical research
Is a treatment being tested?
0
interventional trials for this specific condition
No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present).
Data as of 27 July 2026
No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.
medium confidence · 36.5th percentile (trials denominator)
Recruiting interventional trials
From the matched ClinicalTrials.gov set
No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.
See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.
Where to find support
We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:
India — NPRD
Last verified 2026-07-26This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.
Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.
How we counted this
Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.
"X-linked intellectual disability, Hedera type" OR "MRXSH" OR "X-linked intellectual disability with epilepsy" OR "intellectual developmental disorder, X-linked, syndromic, Hedera type, X-linked recessive" OR "intellectual disability, X-linked, syndromic, Hedera type" OR "mental retardation, X-linked, syndromic, Hedera type"
MeSH descriptor terms unioned into the query: Mental Retardation, X-Linked, with Epilepsy
ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):
"X-linked intellectual disability, Hedera type" OR "MRXSH" OR "X-linked intellectual disability with epilepsy" OR "intellectual developmental disorder, X-linked, syndromic, Hedera type, X-linked recessive" OR "intellectual disability, X-linked, syndromic, Hedera type" OR "mental retardation, X-linked, syndromic, Hedera type" OR "Mental Retardation, X-Linked, with Epilepsy" OR "ATP6AP2" OR "X-linked intellectual disability-epilepsy syndrome"
Recall-expansion terms: ATP6AP2, X-linked intellectual disability-epilepsy syndrome
Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.
Query health: suspect — strategies attempted: phrase, mesh, recall-expansion; with hits: phrase
Run this search on ClinicalTrials.gov
Synonyms dropped by stoplist: MRXE
Confidence reasoning
- Preferred label is multi-word and distinctive
- 1 synonym(s) dropped by stoplist (may under-count)
- No label/synonym collisions with other diseases in this corpus
Ingested 2026-07-27T04:33:49.005Z